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ISL6422
Data Sheet April 10, 2007 FN9190.1
Dual Output LNB Supply and Control Voltage Regulator with I2C Interface for Advanced Satellite Set-Top Box Designs
The ISL6422 is a highly integrated voltage regulator and interface IC, specifically designed for supplying power and control signals from advanced satellite set-top box (STB) modules to the low noise blocks (LNBs) of two antenna ports. The device is consists of two independent current-mode boost PWMs and two low-noise linear regulators along with the circuitry required for 22kHz tone generation, modulation and I2C device interface. The device makes the total LNB supply design simple, efficient and compact with low external component count. Two independent current-mode boost converters provide the linear regulators with input voltages that are set to the final output voltages, plus typically 0.8V to insure minimum power dissipation across each linear regulator. This maintains constant voltage drops across each linear pass element while permitting adequate voltage range for tone injection. The final regulated output voltages are available at two output terminals to support simultaneous operation of two antenna ports for dual tuners. The outputs for each PWM can be controlled in two ways: * Full control from I2C using the VTOP1, VTOP2, VBOT1, and VBOT12 bits, or * Set the I2C to the lower range (13V/14V) and switch to the higher range (18V/19V) with the SELVTOP1 or SELVTOP2 pin. All the functions on this IC are controlled via the I2C bus by writing 8-bit words onto the System Registers (SR). The same register can be read back, and four bits per output will report the diagnostic status. Separate enable commands sent on the I2C bus provide independent standby mode control for each PWM and linear combination, disabling the output into shutdown mode. Each output channel is capable of providing 750mA of continuous current. The overcurrent limit can be digitally programmed. The External modulation input EXTM1/2 can accept a modulated Diseqc command and transfer it symmetrically to the output. Alternatively, the EXTM1 or EXTM2 pin can be used to modulate the continuous internal tone. The FLT pin serves as an interrupt for the processor when an over temperature, overcurrent or backwards overcurrent fault conditions is detected by the LNB controller or when both channels are disabled by the I2C EN bits set low. The nature of the fault can be read of the I2C registers.
Features
* Single Chip Power Solution - True Dual Operation for 2-Tuner/2-Dish Applications - Both Outputs May be Enabled Simultaneously at Maximum Power - Integrated DC/DC Converter and I2C Interface * Switch-Mode Power Converter for Lowest Dissipation - Boost PWMs with >92% Efficiency - Selectable 13.3V or 18.3V Outputs - Digital Cable Length Compensation (1V) - I2C and Pin controllable output * Output Back Bias Capability of 28V * I2C Compatible Interface for Remote Device Control * Four level Slave Address 0001 00XX * 2.5V, 3.3V, 5V Logic Compatible * External Pins to Toggle between V and H Polarization. * Supports DiSEqC 2.0 Protocol * Built-In Tone Oscillator Factory Trimmed to 22kHz - Facilitates DiSEqC (EUTELSAT) Encoding - External Modulation Input * Internal Over-Temperature Protection and Diagnostics * Internal OV, UV, Overload and Overtemp Flags (Visible on I2C) * FLT Signal * LNB Short-Circuit Protection and Diagnostics * QFN, EPTSSOP Packages * Pb-Free Plus Anneal Available (RoHS Compliant)
Applications
* LNB Power Supply and Control for Satellite Set-Top Box
Ordering Information
PART NUMBER (Note) ISL6422ERZ ISL6422ERZ-T ISL6422EVEZ PART MARKING ISL6422ERZ ISL6422ERZ TEMP. RANGE (C) PACKAGE (Pb-free) PKG. DWG. # L40.6x6
-20 to +85 40 Ld 6x6 QFN
-20 to +85 40 Ld 6x6 QFN L40.6x6 (Tape and Reel)
ISL6422EVEZ -20 to+ 85 38 Ld EPTSSOP M38.173B
ISL6422EVEZ-T ISL6422EVEZ -20 to +85 38 Ld EPTSSOP M38.173B (Tape and Reel) NOTE: Intersil Pb-free plus anneal products employ special Pb-free material sets; molding compounds/die attach materials and 100% matte tin plate termination finish, which are RoHS compliant and compatible with both SnPb and Pb-free soldering operations. Intersil Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020.
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc. Copyright Intersil Americas Inc. 2006, 2007. All Rights Reserved All other trademarks mentioned are the property of their respective owners.
ISL6422 Pinouts
ISL6422 (40 LD QFN) TOP VIEW
SELVTOP2 PGND2 VOUT2 GATE2 TCAP2 CS2 1 VSW2 2 VSW2 3 GATE2 4 EXTM2 SGND NC FLT SDA SCL ADDR0 ADDR1 EXTM1 BYP 1 2 3 4 5 6 7 8 9 10 11 PGND1 12 GATE1 13 NC 14 VSW1 15 CS1 16 TXT1 17 SELVTOP1 18 TCAP1 19 AGND 20 VOUT1 ISL6422ERZ 30 29 28 27 26 25 24 23 22 21 VOUT2 TDIN2 TDOUT2 CPVOUT CPSWOUT CPSWIN VCC TDOUT1 TDIN1 VOUT1 PGND2 5 EXTM2 6 SGND 7 FLT 8 SDA 9 SCL 10 ADDR0 11 ADDR1 12 EXTM1 13 BYP 14 PGND1 15 GATE1 16 VSW1 17 VSW1 18 CS1 19 ISL6422EVEZ
ISL6422 (38 LD EPTSSOP) TOP VIEW
38 TXT2 37 SELVTOP2 36 TCAP2 35 NC 34 VOUT2 33 TDIN2 32 TDOUT2 31 CPVOUT 30 CPSWOUT 29 CPSWIN 28 VCC 27 TDOUT1 26 TDIN1 25 VOUT1 24 AGND 23 TCAP1 22 SELVTOP1 21 NC 20 TXT1
VSW2
TXT2
CS2
NC
40
39
38
37
36
35
34
33
32
NC
31
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FN9190.1 April 10, 2007
Block Diagram
17 OLF1 COUNTER OVERCURRENT PROTECTION LOGIC SCHEME 1 PWM LOGIC 12 GATE1 Q S CLK1 SDA SCL ADDR1 PGND1 ISEL1L AND ISEL1H EN1 ENT1 ILIM1 CS AMP 15 CS1 OTF + OUVF2 ADDR0 OUVF11 ISEL2L AND ISEL2H OLF1 FLT OLF2 EN2 I2C ENT2 DCL1 OC1 SELVTOP1 SDA SCL ADDR1 ADDR0 FLT 5 6 8 4 7 OLF2 DCL2 OUVF1 OUVF2 OVERCURRENT PROTECTION LOGIC SCHEME 2 PWM LOGIC CLK2 Q S PGND2 40 COUNTER
OC2
GATE2
39
INTERFACE
VTOP1 VBOT1 CLK1 OSC. 1.1MHz
DCL VBOT2 VTOP2 CLK2
SLOPE COMPENSATION
TONE DECODER 22 TDIN1
TXT1 VREF1
REF VOLTAGE ADJ1 TONE INJ CKT 1
REF VOLTAGE ADJ2 TONE INJ CKT 2
+
INT TONE
VREF2 SELVTOP2 VSW2 34 37
14
VSW1 MSEL1 MSEL2 VOUT2 + TXT2
VOUT1 20, 21 19 AGND + -
EXT TONE CKT 24 VCC ON CHIP LINEAR UVLO POR SOFT-START TXT1 ENT1 ENT2
2
SGND
EXTM2
TCAP1
TXT2
TCAP2
EXTM1
BYP
INT 5V SOFT-START EN1/EN2
OTF
THERMAL SHUTDOWN
CHARGE PUMP CPVOUT
10
16
18
9
1
33
35
NOTE: 1. Pinouts shown are for the QFN package.
-
23
TDOUT1 -
BAND GAP REF VOLTAGE BGV
BGV
DIV AND WAVE SHAPING +
-
+
3
11
FN9190.1 April 10, 2007
ILIM2
CS AMP CS2 36
SLOPE COMPENSATION
ISL6422
30, 31
TDOUT2 28 TONE DECODER TDIN2 CPSWIN CPSWOUT 29 25
27
26
Typical Application Schematic QFN
2 L1 15uH
C5 56uF
0
D1 CMS06
PRELIMINARY
D6 CMS06 L4 4.7uH 1 C3 56uF R4 0 18 C10 10UF 2 C11 10uF C12 10uF C19 0.22uF C27 0.1uF 1 L5 220uH 2 0.22uF 15
VIN RTN
0
FLT BAR SELVTOP2 TXT2
1
0
C25 R7
VLNB2 C21 0.1uF D7 1.5KE24 RTN
1 2 3
PGND2 GATE2 NC VSW2 CS2 TXT2 SELVTOP2 TCAP2 NC VOUT2
TPC6002 Q3
0
40 39 38 37 36 35 34 33 32 31
6 5 4
PGND1 GATE1 NC VSW1 CS1 TXT1 SELVTOP1 TCAP1 AGND VOUT1
1 2 3
L2 15uH
R5 470 R2 0.1
1uF C8
11 12 13 14 15 16 17 18 19 20
6 5 4
4
C6 56uF
0
0
0
D4 CMS06
0
R3 470 C23 10n R14 4.7K 30 29 28 27 26 25 24 23 22 21 R24 47K C17 1uF C29 1.5n
0
R25 10K
0
M7 NDS356AP
0
R1 0.1
C1 100PF
0 0
R6 18
1 2 3 4 5 6 7 8 9 10
EXTM2 SGND NC FLT SDA SCL ADDR0 ADDR1 EXTM1 BYP
U1 ISL6422ER
VOUT2 TDIN2 TDOUT2 CPVOUT CPSWOUT CPSWIN VCC TDOUT1 TDIN1 VOUT1
Q6 2N2222A
0
L6 1 C26 R8
220uH 2 0.22uF 15
0
ISL6422
0
C28 0.1uF
VLNB1 C22 0.1UF D8 1.5KE24 RTN
0
2 TPC6002 Q4
0
D3 CMS06
C24 10n
0
0
0 0
0
C16 1uF C20 0.22uF R13 4.7K R22 47K R23 10K M6 NDS356AP Q5 2N2222A
0
C2 100PF
1
0
0
0
0
0 0 0
TDOUT2 EXTM1 SELVTOP1
D2 1 CMS06 C4 56uF
L3 4.7uH 2 C14 10uF C15 10uF C13 10uF
D5
CMS06
EXTM2
0
TXT1 SDA
FN9190.1 April 10, 2007
0
100 100
0
0
R10 R11
SCL TDOUT1
CONFIDENTIAL
ISL6422
Absolute Maximum Ratings
Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . 8.0V to 18.0V Logic Input Voltage Range (SDA, SCL, ENT, DSQIN1 and DSQIN2, SEL18V1 and SEL18V2) . . . . . . . . . . . . . . . . . . . . . . -0.5V to 7V
Thermal Information
Thermal Resistance (Typical, Notes 2, 3) JA (C/W) JC (C/W) EPTSSOP Package . . . . . . . . . . . . . . . 29 4 QFN Package. . . . . . . . . . . . . . . . . . . . 34 6 Maximum Junction Temperature (Note 4) . . . . . . . . . . . . . . . +150C Maximum Storage Temperature Range . . . . . . . . . . -40C to +150C Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . +300C (SOIC - Lead Tips Only) Operating Temperature Range . . . . . . . . . . . . . . . . . -20C to +85C
CAUTION: Stresses above those listed in "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. +150C max junction temperature is intended for short periods of time to prevent shortening the lifetime. Operation close to +150C junction may trigger the shutdown of the device even before +150C, since this number is specified as typical.
NOTES: 2. JA is measured in free air with the component mounted on a high effective thermal conductivity test board with "direct attach" features. See Tech Brief TB379. 3. For JC, the "case temp" location is the center of the exposed metal pad on the package underside. 4. The device junction temperature should be kept below +150C. Thermal shut-down circuitry turns off the device if junction temperature exceeds +150C typically.
Electrical Specifications
VCC = 12V, TA = -20C to +85C, unless otherwise noted. Typical values are at TA = +25C. EN1 = EN2 = H, VTOP1 = VTOP2 = L, ENT1 = ENT2 = L, DCL = L, DSQIN1 = DSQIN2 = L, IOUT = 12mA, unless otherwise noted. See "ISL6422 Software Description" on page 12 for I2C access to the system. SYMBOL TEST CONDITIONS MIN 8 EN1 = EN2 = L IIN EN1 = EN2 = VTOP1 = VTOP2 = VBOT1 = VBOT2 = ENT1 = ENT2 = H, No Load TYP 12 1.5 4.0 MAX 14 3.0 8.0 UNITS V mA mA
PARAMETER Operating Supply Voltage Range Standby Supply Current Supply Current UNDERVOLTAGE LOCKOUT Start Threshold Stop Threshold Start to Stop Hysteresis SOFT-START COMP Rise Time (Note 5) Output Voltage (Note 5)
7.5 7.0 350 400
7.95 7.55 500
V V mV
(Note 5) VOUT1 VOUT1 VOUT1 VOUT1 VOUT2 VOUT2 VOUT2 VOUT2 (Refer to Table 11) (Refer to Table 11) (Refer to Table 11) (Refer to Table 11) (Refer to Table 15) (Refer to Table 15) (Refer to Table 15) (Refer to Table 15) VIN = 8V to 14V; VOUT1, VOUT2 = 13V VIN = 8V to 14V; VOUT1, VOUT2 = 18V IO = 12mA to 350mA IO = 12mA to 750mA 13.04 14.02 17.94 19.00 13.04 14.02 17.94 19.00
8196 13.3 14.3 18.3 19.3 13.3 14.3 18.3 19.3 4.0 4.0 50 100 13.56 14.58 18.66 19.68 13.56 14.58 18.66 19.68 40.0 60.0 80 200
Cycles V V V V V V V V mV mV mV mV
Line Regulation
DVOUT1, DVOUT2 DVOUT1, DVOUT2
Load Regulation
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FN9190.1 April 10, 2007
ISL6422
Electrical Specifications
VCC = 12V, TA = -20C to +85C, unless otherwise noted. Typical values are at TA = +25C. EN1 = EN2 = H, VTOP1 = VTOP2 = L, ENT1 = ENT2 = L, DCL = L, DSQIN1 = DSQIN2 = L, IOUT = 12mA, unless otherwise noted. See "ISL6422 Software Description" on page 12 for I2C access to the system. (Continued) SYMBOL IMAX TEST CONDITIONS DCL = 0, ISEL1H and ISEL2H = 0, ISEL1L and ISEL2L = 0, ISEL1R and ISEL2R = 0 DCL = 0, ISEL1H and ISEL2H = 0, ISEL1L and ISEL2L = 0, ISEL1R and ISEL2R = 1 DCL = 0, ISEL1H and ISEL2H = 0, ISEL1L and ISEL2L = 1, ISEL1R and ISEL2R = 1 DCL = 0, ISEL1H and ISEL2H = 1, ISEL1L and ISEL2L = 0, ISEL1R and ISEL2R = 1 DCL = 0, ISEL1H and ISEL2H = 1, ISEL1L and ISEL2L = 1, ISEL1R and ISEL2R = 1 Dynamic Overload Protection Off Time Dynamic Overload Protection On Time Static Output Current Limiting Cable Fault CABF Asserted High TONE OSCILLATOR Tone Frequency Tone Amplitude Tone Duty Cycle Tone Rise or Fall Time TONE DECODER Input Amplitude Frequency Capture Range Input Impedance Detector Output Voltage Detector Output Leakage Tone Decoder Rx Threshold Tone Decoder Tx Threshold LINEAR REGULATOR Drop-out Voltage Output Backward Leakage Current Output Backward Leakage Current Output Backward Current Threshold Output Backward Voltage Output Under Voltage (Asserted high during Softstart) Output Over Voltage (Asserted high during softstart) IOBK IOBK IOBKTH IOBK IOUT = 750mA EN1 and EN2 = 0; VOBK = 27V EN1 and EN2 = 0; VOBK = 28V EN1 and EN2 = 1; VOFAULT = 19V (Note 7) EN1 and EN2 = 0 OUVF1/2 bit is asserted high, Measured from the typ. output set value OUVF1/2 bit is asserted high, Measured from the typ. output set value -6 +2 0.8 2.0 15.0 125 27 2 +6 1.0 3.0 17.0 V mA mA mA V % % Vtdin Ftdin Zdet Vtdout_L Itdout_H VRXth VTXth Tone Present, Iload = 3mA Tone absent, Vo = 6V TXT1 and TXT2 = L TXT1 and TXT2 = H 100 400 150 450 200 17.5 8.6 0.4 10 200 500 1000 26.5 mV kHz k V A mV mV ftone Vtone dctone Tr, Tf ENT1 and ENT2 = H ENT1 and ENT2 = H, IOUT = 5mA ENT1 and ENT2 = H ENT1 and ENT2 = H 20.0 500 40 5 22.0 680 50 10 24.0 800 60 14 kHz mV % s TOFF TON IMAX ICAB DCL = 1 (Note 8) EN1 and EN2 = 1; 2 DCL = L, Output Shorted (Note 8) MIN 270 TYP 305 MAX 345 UNITS mA
PARAMETER Dynamic Output Current Limiting (Note 8)
350
388
422
mA
515
570
630
mA
635
705
775
mA
800
890
980
mA
900 20 990 10 20
ms ms mA mA
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FN9190.1 April 10, 2007
ISL6422
Electrical Specifications
VCC = 12V, TA = -20C to +85C, unless otherwise noted. Typical values are at TA = +25C. EN1 = EN2 = H, VTOP1 = VTOP2 = L, ENT1 = ENT2 = L, DCL = L, DSQIN1 = DSQIN2 = L, IOUT = 12mA, unless otherwise noted. See "ISL6422 Software Description" on page 12 for I2C access to the system. (Continued) SYMBOL TEST CONDITIONS MIN TYP MAX UNITS
PARAMETER
TXT1 AND TXT2, EXTM1 AND EXTM2, SELVTOP1 AND SELVTOP2, ADDR0 AND ADDR1 INPUT PINs (Note 8) Asserted LOW Asserted HIGH Input Current CURRENT SENSE (CS pin) Input Bias Current Overcurrent Threshold ERROR AMPLIFIER Open Loop Voltage Gain Gain Bandwidth Product PWM Maximum Duty Cycle Minimum Pulse Width OSCILLATOR Oscillator Frequency Thermal Shutdown Temperature Shutdown Threshold Temperature Shutdown Hysteresis FLT FLT (released) FLT (asserted) NOTES: 5. Internal digital soft-start. 6. The EXTM1 and EXTM2, SELVTOP1 and SELVTOP2, TXT1 and TXT2, and ADDR0 and ADDR1 pins have 200k internal pull-downs. 7. On exceeding this dynamic back current limit threshold for a period of 100s, the device enters the dynamic current limit mode, and the BCF I2C bit is set. The dynamic back current limit duty during a BCF is ON = 100s or OFF = 5ms. 8. In the dynamic back current limit mode, the output is ON for 20ms and OFF for 900ms, but remains continuously ON in the Static mode. When tone is ON, the minimum current limit is 50mA lower than the values indicated in the table. While in the dynamic mode of current limit, the trip level is momentarily increased to 990mA during the 20ms ON time to facilitate recovery from overload conditions. VO = 6V ISINK = 3.2mA (1.5k pull-up resistor to 5V) 10 0.4 A V 150 20 C C fo Fixed at (20) (ftone) 396 440 484 kHz 90 93 20 % ns AOL
GBP
0.8 1.7 25
V V A
IBIAS VCS Static current mode, DCL = H 325
700 450 500
nA mV
88 14
dB MHz
7
FN9190.1 April 10, 2007
ISL6422 Tone Waveform
ENT1/2 I2C
MSEL1/2 I2C
EXTM1/2 PIN
VOUT1/2 PIN 22kHz 22kHz 22kHz 22kHz 22kHz 22kHz
Internal Tone Tr = 10s typ
Internal Tone Tr = 10s typ
Tr = 10s typ Internal Tone Returns to nominal VOUT ~1 period after the last EXTM rising edge T > 55s
NOTES: 9. The logic presented to the signal pins TXT1 and TXT2 changes the decoder threshold during tone Transmit and Receive. TTH1 and TTH2 allow threshold control through the I2C provided that TXT1 and TXT2 = 0. 10. The tone rise and fall times are not shown due to resolution of graphics. It is 10s typ for 22kHz. 11. The EXTM1 and EXTM2 pins have input thresholds of VIL(max) = 0.8V and VIH(min) = 1.7V FIGURE 1. TONE WAVEFORM
Typical Performance Curves
0.820 0.810 0.810 IOUT IN A IOUT IN A 0.760
0.800
0.710
0.790
0.780 0 20 40 TAMB (C) 60 80
0.660 0 20 40 TAMB (C) 60 80
FIGURE 2. OUTPUT CURRENT DERATING 38 LD HTSSOP: IOUT_max vs TAMB NOTE: With both channels in simultaneous operation at rated output.
\
FIGURE 3. OUTPUT CURRENT DERATING 40 LD 6x6 QFN: IOUT_max vs TAMB
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FN9190.1 April 10, 2007
ISL6422 Functional Pin Descriptions
SYMBOL SDA SCL VSW1 and VSW2 PGND1 and PGND2 CS1 and CS2 SGND TCAP1 and TCAP2 BYP TXT1 and TXT2 Bidirectional data from/to I2C bus. Clock from I2C bus. Input of the linear post-regulator. Dedicated ground for the output gate driver of respective PWM. Current sense input; connect the sense resistor Rsc at this pin for desired overcurrent value for respective PWM. Small signal ground for the IC. Capacitor for setting rise and fall time of the output of LNB A and LNB B respectively. Typical value is 0.22F. Bypass capacitor for internal 5V. TXT1 and TXT2 are the Tone Transmit signal inputs used to change the tone decoder threshold. The threshold is 200mV max for the Rx mode when the TXT1 and TXT2 are set low. The threshold is 400mV min in the Tx mode when TXT1 and TXT2 are set high. If Tx/Rx mode is set by I2C bit TTH(1 ,2), when TTH(1, 2) = 1, then TXT(1, 2) will be driven high (5V) by an on-chip driver. Main power supply to the chip. These are the device outputs of PWM A and PWM B respectively. These high current driver outputs are capable of driving the gate of a power FET. These outputs are actively held low when VCC is below the UVLO threshold. Output voltage for LNB A and LNB B respectively. Address pins select four different device addresses per Table 19. These pins can be used in two ways: 1. As an input for externally modulated Diseqc tone signal that is transferred symmetrically onto VOUT. 2. Alternatively apply a Diseqc modulation envelope that modulates an internal tone and then transfers it symmetrically onto VOUT. FLT This is an open drain output from the controller. When the FLT goes low, it indicates that an Over Temperature has occurred. The processor should then look at the I2C register to get the actual cause of the error. A high on the FLT indicates that the device is functioning normally. A 47nF charge pump cap is connected to CPVOUT. Connect a 1.5nF capacitor between CPSWIN and CPSWOUT. The following description applies to both pins and both bits. When this pin is low, the VOUT is in the 13V/14V range selected by the I2C bit VBOT1 and VBOT2. When this pin is high, the 18V/19V range is selected by the I2C bit VTOP1 and VTOP2. The voltage select pin voltage VSPEN1 and VSPEN2 I2C bit must be set low for the SELVTOP1 and SELVTOP2 pins to be active. Setting VSPEN1 and VSPEN2 high disables these pins and voltage selection will be done using the I2C bits VBOT1 and VBOT2 and VTOP1 and VTOP2 only. TDIN1 and TDIN2 are the tone decoder inputs for channels 1 and 2. TDOUT1 and TDOUT2 are the tone detector outputs for channels 1 and 2. TDOUT1 and TDOUT2 are open drain outputs. Analog ground for the IC. FUNCTION
VCC GATE1 and GATE2 VOUT1 and VOUT2 ADDR0 and ADDR1 EXTM1 and EXTM2
CPVOUT, CPSWIN, CPSWOUT SELVTOP1 and SELVTOP2
TDIN1 and TDIN2 TDOUT1 and TDOUT2 AGND
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FN9190.1 April 10, 2007
ISL6422 Functional Description
The ISL6422 dual output voltage regulator makes an ideal choice for advanced satellite set-top box and personal video recorder applications. Both supply and control voltage outputs for two low-noise blocks (LNBs) are available simultaneously in any output configuration. The device utilizes built-in DC/DC step up converters that, from a single supply source ranging from 8V to 14V, generate the voltages that enable the linear post-regulators to work with a minimum of dissipated power. An undervoltage lockout circuit disables the device when VCC drops below a fixed threshold (7.5V typical). TXT1 or TXT2 pin. If tone is detected, the open drain pin TDOUT1 or TDOUT2 is asserted low. This also enables the tone diagnostics to be performed, apart from the normal tone detection function.
Linear Regulator
The output linear regulator will sink and source current. This feature allows full modulation capability into capacitive loads as high as 0.75F. In order to minimize the power dissipation, the output voltage of the internal step-up converter is adjusted to allow the linear regulator to work at minimum dropout. When the device is put in the shutdown mode (EN1 and EN2 = LOW), both PWM power blocks are disabled (that is, when EN1 = 0, PWM1 is disabled, and when EN2 = 0, PWM2 is disabled). When the regulator blocks are active (EN1 and EN2 = HIGH, and VSPEN1 and VSPEN2 = LOW), the output can be controlled via I2C logic to be between 13V and 14V or between 18V and 19V (typical) by means of the Voltage Select bits (VTOP1, VTOP2, VBOT1, and VBOT2) for remote controlling of non-DiSEqC LNBs. When the regulator blocks are active (EN1 and EN2 = HIGH, and VSPEN1 and VSPEN2 = HIGH), the VBOT1 and VBOT2 bits and the SELVTOP1 and SELVTOP2 pins will control the output between 13V and 14V and the VTOP1 and VTOP2 and the SELVTOP1 and SELVTOP2 pins will control the output between 18V and 19V.
DiSEqC Encoding
The internal oscillator is factory-trimmed to provide a tone of 22kHz in accordance with DiSEqC (EUTELSAT) standards. No further adjustment is required. The tone oscillator can be controlled either by the I2C interface (ENT1 or ENT2 bit) or by a dedicated pin (EXTM1 or EXTM2) that allows immediate DiSEqC data encoding separately for each LNB. All the functions of this IC are controlled via the I2C bus by writing to the system registers. The same registers can be read back, and four bits will report the diagnostic status. The internal oscillator operates the converters at twenty times the 22k tone frequency. The device offers full I2C compatibility and supports 2.5V, 3.3V or 5V logic, and up to 400kHz operation. If the Tone Enable bits (ENT1 and ENT2) are set LOW and the MSEL1 and MSEL2 bits set LOW through I2C, then the EXTM1 and EXTM2 terminal activates the internal tone signal, modulating the DC output with a 680mVpp typ symmetrical tone waveform. The presence of this signal usually provides the LNB with information about the band to be received. Burst coding of the tone can be accomplished due to the fast response of the EXTM1 and EXTM2 input and rapid tone response. This allows implementation of the DiSEqC (EUTELSAT) protocols. When the ENT1 or ENT2 bit is set HIGH, a continuous 22kHz tone is generated regardless of the EXTM1 and EXTM2 pin logic status for the corresponding regulator channel (LNB-A or LNB-B). The ENT1 or ENT2 bit must be set LOW when the EXTM1 and/or EXTM2 pin is used for DiSEqC encoding. The EXTM1 and EXTM2 pins also accept an externally modulated tone command when the MSEL1 or MSEL2 I2C bit is set high.
Output Timing
The output voltage rise and fall times can be set by an the external capacitor on the TCAP1 and TCAP2 pins. The output rise and fall times is given by Equation 1:
( 270 )T C = -----------------V (EQ. 1)
where: * C is the TCAP value in nF * T is the required slew rate in ms, and * V is the differential transition voltage from low output voltage range to the high output range in Volts. Rise and fall time will typically be the same. The maximum recommended value for TCAP1 and TCAP2 would be the base on the maximum transition time allowed in the system application. Too small a value of TCAP1 and TCAP2 can cause high peak currents in the boost circuit. For example, a 10V/mS slew on a 80F VSW capacitor with an inductor of 15H can cause a peak inductor current of approximately 2.3A
DiSEqC Decoder
TDIN1 and TDIN2 are the inputs to the tone decoders of channels 1 and 2 respectively. They accept the tone signal derived from the VOUT through the 10nF decoupling capacitor. The detector threshold can be set to 200mV maximum in the Receive mode and to 400mV minimum in the Transmit mode by means of the logic presented to the
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FN9190.1 April 10, 2007
ISL6422
Current Limiting
The dynamic back current limit block has five thresholds that can be selected by the following bits of the SR. * ISEL1H and ISEL2H * ISEL1L and ISEL2L * ISEL1R and ISEL2R See Table 8 and Table 9 for threshold selection using these bits. The DCL1 and DCL2 bits have to be set to low for this mode of operation. In this mode, the overcurrent protection circuit works dynamically 23s after an overload is detected, and the output is shutdown for a time tOFF, typically 900ms. Simultaneously, the OLF1 or OLF2 bit of the System Register is set to HIGH. After this time has elapsed, the output is resumed for a time tON = 20ms. During tON, the device output will be current limited to a 990mA typ level. If the overload is still detected, the protection circuit will cycle again through tOFF and tON. At the end of a full tON, in which no overload is detected, normal operation is resumed and the OLF1 or OLF2 bit is reset to LOW. Typical tON + tOFF time is 920ms as determined by an internal timer. This dynamic operation can greatly reduce the power dissipation in a short circuit condition, still ensuring excellent power-on start-up in most conditions. However, there could be some cases in which a highly capacitive load on the output may cause a difficult start-up when the dynamic protection is chosen. This can be solved by initiating any power start-up in static mode (DCL = HIGH) and then switching to the dynamic mode (DCL = LOW) after a chosen amount of time. When in static mode, the OLF1 or OLF2 bit goes HIGH when the peak current sense threshold is reached and returns LOW when the overload condition is cleared. The OLF1, OLF2, BCF1, and BCF2 bits will be LOW at the end of initial power-on soft-start. In the static mode the output current through the linears is limited to 990mA typ. When a 19.3V line is connected onto a VOUT1 or VOUT2 pin that has been set to 13.3V, the linear will then enter a dynamic back current limit state. When a dynamic back current limit of greater that 125mA typ is sensed at the lower FET of the linear for a period greater that 100s, the output is disabled for a period of 5ms and the BCF1 and BCF2 bits are set. If the 19.3V remains connected, the output will cycle through the ON = 100s/OFF = 5ms. The output will recover when the fault is removed. The FLT pin serves as an interrupt for the processor when an over temperature, overcurrent or backwards overcurrent fault is detected by the LNB controller or when both channels are disabled by the I2C EN1 and EN2 bits being set low. Should the I2C lose power (for example by shorting BYP pin to ground), it is designed to power up with all control bits set to 0 (particularly the EN1 and EN2 bits). This prevents the device from coming back up in a state not desired by the host controller. If the host controller sees a FLT low, it should read the I2C bits and find both EN1 and EN2 bits low. When it desires one or both to be high, it should re-write the I2C to the desired state.
External Output Voltage Selection
The output voltage can be selected by the I2C bus. Additionally, the package offers two pins (SELVTOP1 and SELVTOP2) for independent 13 through 19V output voltage selection.
TABLE 1. VSPEN1, VSPEN2 0 0 0 0 1 1 1 1 VTOP1, VTOP2 X X 0 1 0 0 1 1 VBOT1, VBOT2 0 1 X X 0 1 0 1 SELVTOP1, SELVTOP2 0 0 1 1 X X X X VOUT1, VOUT12 13.3V 14.3V 18.3V 19.3V 13.3V 14.3V 18.3V 19.3V
I2C Bus Interface for ISL6422
(Refer to Phillips I2C Specification, Rev. 2.1) Data transmission from the main microprocessor to the ISL6422 and vice versa takes place through the two-wire I2C bus interface, consisting of the two lines SDA and SCL. Both SDA and SCL are bidirectional lines. They are connected to a positive supply voltage via a pull-up resistor. (Pull-up resistors to positive supply voltage must be externally connected.) When the bus is free, both lines are HIGH. The output stages of ISL6422 will have an open drain/open collector in order to perform the wired-AND function. Data on the I2C bus can be transferred up to 100Kbps in the standard mode or up to 400Kbps in the fast mode. The level of logic "0" and logic "1" depends on the value of VDD as per the Electrical Specification table on page 5. One clock pulse is generated for each data bit transferred.
Thermal Protection
This IC is protected against overheating. When the junction temperature exceeds +150C (typical), the step-up converter and the linear regulator are shut off and the OTF bit of the SR is set HIGH. Normal operation is resumed and the OTF bit is reset LOW when the junction is cooled down to +130C (typical).
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ISL6422
Data Validity
The data on the SDA line must be stable during the HIGH period of the clock. The HIGH or LOW state of the data line can change only when the clock signal on the SCL line is LOW. Refer to Figure 4. The ISL6422 will not generate the acknowledge if the POWER OK signal from the UVLO is LOW.
SCL 1 SDA MSB SDA START ACKNOWLEDGE FROM SLAVE 2 8 9
SCL DATA LINE CHANGE STABLE OF DATA DATA VALID ALLOWED
FIGURE 6. ACKNOWLEDGE ON THE I2C BUS
Transmission Without Acknowledge
Avoiding detection of the acknowledgement, the microprocessor can use a simpler transmission; it waits one clock pulse without checking the slave acknowledging and sends the new data. This approach, though, is less protected from error and decreases the noise immunity.
FIGURE 4. DATA VALIDITY
START and STOP Conditions
As shown in Figure 5, the START condition is a HIGH to LOW transition of the SDA line while SCL is HIGH. The STOP condition is a LOW to HIGH transition on the SDA line while SCL is HIGH. A STOP condition must be sent before each START condition.
ISL6422 Software Description
Interface Protocol
The interface protocol is comprised of the following, as shown in Table 2:
SDA
* Start condition (S) * Chip address byte (MSB on left; the LSB bit determines read (1) or write (0) transmission) (the assigned I2C slave address for the ISL6422 is 0001 00XX)
S P STOP CONDITION
SCL START CONDITION
* Sequence of data (1 byte + Acknowledge) * Stop condition (P)
TABLE 2. INTERFACE PROTOCOL S0 0 0 1 0 0 0 R/W ACK Data (8 bits) ACK P
FIGURE 5. START AND STOP WAVEFORMS
Byte Format
Every byte put on the SDA line must be eight bits long. The number of bytes that can be transmitted per transfer is unrestricted. Each byte has to be followed by an acknowledge bit. Data is transferred with the most significant bit first (MSB).
System Register Format
* R, W = Read and Write bit * R = Read-only bit * X = Unused
All bits reset to 0 at Power-On
Acknowledge
The master (microprocessor) puts a resistive HIGH level on the SDA line during the acknowledge clock pulse (see Figure 6). The peripheral that acknowledges has to pull down (LOW) the SDA line during the acknowledge clock pulse, so that the SDA line is stable LOW during this clock pulse. (Set-up and hold times must also be taken into account.) The peripheral which has been addressed has to generate an acknowledge after the reception of each byte, otherwise the SDA line remains at the HIGH level during the ninth clock pulse time. In this case, the master transmitter can generate the STOP information in order to abort the transfer.
R, W SR1H
TABLE 3. STATUS REGISTER 1 (SR1) R, W SR1M R, W SR1L R OTF R R R R BCF1
CABF1 OUVF1 OLF1
TABLE 4. TONE REGISTER 2 (SR2) R, W SR2H R, W SR2M R, W SR2L R, W ENT1 R, W R, W R, W X R, W X
MSEL1 TTH1
TABLE 5. COMMAND REGISTER 3 (SR3) R, W R, W R, W R, W R, W R, W R, W R, W
SR3H SR3M SR3L
DCL1 VSPEN1 ISEL1R ISEL1H ISEL1L X
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TABLE 6. CONTROL REGISTER 4 (SR4) R, W SR4H R, W SR4M R, W SR4L R, W EN1 R, W X R, W X R, W R, W R, W TABLE 9. COMMAND REGISTER 7 (SR7) R, W R, W R, W R, W R, W R, W R, W
VTOP1 VBOT1
SR7H SR7M SR7L
DCL2 VSPEN2 ISEL2R ISEL2H ISEL2L
TABLE 7. STATUS REGISTER 5 (SR5) R, W SR5H R, W SR5M R, W SR5L X X R R R R BCF2 R, W SR8H
TABLE 10. CONTROL REGISTER 8 (SR8) R, W SR8M R, W SR8L R, W EN2 R, W X R, W X R, W R, W
CABF2 OUVF2 OLF2
VTOP2 VBOT2
TABLE 8. TONE REGISTER 6 (SR6) R, W SR6H R, W SR6M R, W SR6L R, W ENT2 R, W R, W R, W X R, W X
Transmitted Data (I2C bus WRITE mode)
When the R/W bit in the chip is set to 0, the main microprocessor can write on the system registers (SR1 through SR8) of the ISL6422 via I2C bus. These will be written by the microprocessor as shown below. The spare bits of registers can be used for other functions.
MSEL2 TTH2
TABLE 11. STATUS REGISTER SR1 CONFIGURATION SR1H 0 0 0 0 0 0 0 0 0 0 0 SR1M 0 0 0 0 0 0 0 0 0 0 0 SR1L 0 0 0 0 0 0 0 0 0 0 0 OTF X X X X X X X X X 0 1 CABF1 X X X X X X X 0 1 X X OUVF1 X X X X X 0 1 X X X X OLF1 X 0 1 X X X X X X X X BCF1 X X X 0 1 X X X X X X SR1 is selected IOUT set limit, Normal Operation IOUT >Static / Dynamic Limiting Mode/Power blocks disabled IOBCK set limit, Normal Operation IOBCK >Dynamic Limiting Mode/Power blocks disabled VIN/VOUT within specified range VIN/VOUT is not within specified range Cable is connected, Io is >20mA Cable is open, Io <2mA TJ 130C, Normal operation TJ >150C, Power blocks disabled FUNCTION
NOTE: X indicates "Read Only" and is a "Don't Care" for the Write mode. TABLE 12. TONE REGISTER SR2 CONFIGURATION SR2H 0 0 0 0 0 0 SR2M 0 0 0 0 0 0 SR2L 1 1 1 1 1 1 ENT1 X 0 0 1 X X MSEL1 X 0 1 0 X X TTH1 X X X X 0 1 X X X X X X X X X X X X X X SR2 is selected Internal Tone = 22kHz, modulated by EXTM1, Tr, Tf = 10s typ Ext 22K modulated input, Tr, Tf = 10s typ Internal Tone = 22kHz, modulated by the ENT1 bit, Tr, Tf = 10s typ TXT = 0; Decoder Rx threshold is set at 200mV max TXT = 0; Decoder Tx threshold is set at 400mV min FUNCTION
NOTE: X is a "Don't Care" for the Write mode.
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TABLE 13. COMMAND REGISTER SR3 CONFIGURATION SR3H 0 0 0 0 0 0 0 0 0 0 SR3M 1 1 1 1 1 1 1 1 1 1 SR3L 0 0 0 0 0 0 0 0 0 0 DCL1 X 0 0 0 0 0 1 0 X X VSPEN1 ISEL1R ISEL1H ISEL1L X X X X X X X X 0 1 X 0 1 1 1 1 X X X X X X 0 0 1 1 X X X X X X X X 0 1 0 1 X SR3 is selected IOUT1 = 275mA maximum IOUT1 = 350mA maximum IOUT1 = 515mA maximum IOUT1 = 635mA maximum IOUT1 = 800mA maximum Dynamic current limit NOT selected Dynamic current limit selected SELVTOP H/W pin Enabled SELVTOP H/W pin Disabled FUNCTION
NOTE: X is a "Don't Care" for the Write mode.
TABLE 14. CONTROL REGISTER SR4 CONFIGURATION SR4H 0 0 0 0 0 0 0 0 0 0 0 0 0 0 SR4M 1 1 1 1 1 1 1 1 1 1 1 1 1 1 SR4L 1 1 1 1 1 1 1 1 1 1 1 1 1 1 EN1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X VTOP1 0 0 0 1 1 0 0 1 1 0 0 1 1 X VBOT1 0 0 1 0 1 0 1 0 1 0 1 0 1 X SR4 is selected VSPEN1 = SELVTOP1 = 0, VOUT1 = 13V, VBOOST1 = 13V + VDROP VSPEN1 = SELVTOP1 = 0, VOUT1 = 14V, VBOOST1 = 14V + VDROP VSPEN1 = SELVTOP1 = 0, VOUT1 = 13V, VBOOST1 = 13V + VDROP VSPEN1 = SELVTOP1 = 0, VOUT1 = 14V, VBOOST1 = 14V + VDROP VSPEN1 = 0, SELVTOP1 = 1, VOUT1 = 18V, VBOOST1 = 18V + VDROP VSPEN1 = 0, SELVTOP1 = 1, VOUT1 = 18V, VBOOST1 = 18V + VDROP VSPEN1 = 0, SELVTOP1 = 1, VOUT1 = 19V, VBOOST1 = 19V + VDROP VSPEN1 = 0, SELVTOP1 = 1, VOUT1 = 19V, VBOOST1 = 19V + VDROP VSPEN1 = 1, SELVTOP1 = X, VOUT1 = 13V, VBOOST1 = 13V + VDROP VSPEN1 = 1, SELVTOP1 = X, VOUT1 = 14V, VBOOST1 = 14V + VDROP VSPEN1 = 1, SELVTOP1 = X, VOUT1 = 18V, VBOOST1 = 18V + VDROP VSPEN1 = 1, SELVTOP1 = X, VOUT1 = 19V, VBOOST1 = 19V + VDROP PWM and Linear for channel 1 disabled FUNCTION
NOTE: X is a "Don't Care" for the Write mode.
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TABLE 15. STATUS REGISTER SR5 CONFIGURATION SR5H 1 1 1 1 1 1 1 1 1 SR5M 0 0 0 0 0 0 0 0 0 SR5L 0 0 0 0 0 0 0 0 0 X X X X X X X X X CABF2 OUVF2 X X X X X X X 0 1 X X X X X 0 1 X X OLF2 X 0 1 X X X X X X BCF2 X X X 0 1 X X X X SR5 is selected IOUT set limit, Normal Operation IOUT > Static/Dynamic Limiting Mode/Power blocks disabled IOBCK set limit, Normal Operation IOBCK > Dynamic Limiting Mode/Power blocks disabled VIN/VOUT within specified range VIN/VOUT is not within specified range Cable is connected, Io is >20mA Cable is open, Io <2mA FUNCTION
NOTE: X indicates "Read Only" state. TABLE 16. TONE REGISTER SR6 CONFIGURATION SR6H 1 1 1 1 1 1 SR6M 0 0 0 0 0 0 SR6L 1 1 1 1 1 1 ENT2 X 0 0 1 X X MSEL2 X 0 1 0 X X TTH2 X X X X 0 1 X X X X X X X X X X X X X X SR2 is selected Int Tone = 22kHz, modulated by EXTM2, Tr, Tf = 10s typ Ext 22k modulated input, Tr, Tf = 10s typ Int Tone = 22kHz, modulated by ENT2 bit, Tr, Tf = 10s typ TXT2 = 0; Decoder Rx threshold is set at 200mV max TXT2 = 0; Decoder Tx threshold is set at 400mV min FUNCTION
NOTE: X is a "Don't Care" for the Write mode. TABLE 17. COMMAND REGISTER SR7 CONFIGURATION SR7H 1 1 1 1 1 1 1 1 1 1 SR7M 1 1 1 1 1 1 1 1 1 1 SR7L 0 0 0 0 0 0 0 0 0 0 DCL2 X 0 0 0 0 0 1 0 X X VSPEN2 ISEL2R ISEL2H ISEL2L X X X X X X X X 0 1 X 0 1 1 1 1 X X X X X X 0 0 1 1 X X X X X X 0 1 0 1 X X X X SR7 is selected IOUT1 = 275mA max. IOUT1 = 350mA max. IOUT1 = 515mA max. IOUT1 = 635mA max. IOUT1 = 800mA max. Dynamic current limit NOT selected Dynamic current limit selected SELVTOP H/W pin Enabled SELVTOP H/W pin Disabled FUNCTION
NOTE: X is a "Don't Care" for the Write mode.
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TABLE 18. CONTROL REGISTER SR8 CONFIGURATION SR8H 1 1 1 1 1 1 1 1 1 1 1 1 1 1 SR8M 1 1 1 1 1 1 1 1 1 1 1 1 1 1 SR8L 1 1 1 1 1 1 1 1 1 1 1 1 1 1 EN2 1 1 1 1 1 1 1 1 1 1 1 1 1 0 X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X VTOP2 0 0 0 1 1 0 0 1 1 0 0 1 1 X VBOT2 0 0 1 0 1 0 1 0 1 0 1 0 1 X SR4 is selected VSPEN2 = SELVTOP2 = 0, VOUT1 = 13V, VBOOST1 = 13V + VDROP VSPEN2 = SELVTOP2 = 0, VOUT1 = 14V, VBOOST1 = 14V + VDROP VSPEN2 = SELVTOP2 = 0, VOUT1 = 13V, VBOOST1 = 13V + VDROP VSPEN2 = SELVTOP2 = 0, VOUT1 = 14V, VBOOST1 = 14V + VDROP VSPEN2 = 0,SELVTOP2 = 1, VOUT1 = 18V, VBOOST1 = 18V + VDROP VSPEN2 = 0, SELVTOP2 = 1, VOUT1 = 18V, VBOOST1 = 18V + VDROP VSPEN2 = 0, SELVTOP2 = 1, VOUT1 = 19V, VBOOST1 = 19V + VDROP VSPEN2 = 0, SELVTOP2 = 1, VOUT1 = 19V, VBOOST1 = 19V + VDROP VSPEN2 = 1, SELVTOP2 = X, VOUT1 = 13V, VBOOST1 = 13V + VDROP VSPEN2 = 1, SELVTOP2 = X, VOUT1 = 14V, VBOOST1 = 14V + VDROP VSPEN2 = 1, SELVTOP2 = X, VOUT1 = 18V, VBOOST1 = 18V + VDROP VSPEN2 = 1, SELVTOP2 = X, VOUT1 = 19V, VBOOST1 = 19V + VDROP PWM and Linear for channel 1 disabled FUNCTION
NOTE: X is a "Don't Care" for the Write mode.
Received Data (I2C bus READ MODE)
The ISL6422 can provide to the master a copy of the system register information via the I2C bus in read mode. The read mode is master-activated by sending the chip address with the R/W bit set to 1. At the following master-generated clock bits, the ISL6422 issues a byte on the SDA data bus line (MSB transmitted first). At the ninth clock bit, the MCU master can: * Acknowledge the reception, thus starting the transmission of another byte from the ISL6422. * Not acknowledge, thus stopping the read mode communication. While the whole register is read back by the microprocessor, the following read-only bits convey diagnostic information about the ISL6422. * * * * OUC1 and OUC2 (Over or Undercurrent bits) UV1 and UV2 (Over or Undervoltage bits) TPR1 and TPR2 (Tone present bits) OTF (Over-temperature fault bit).
Power-On I2C Interface Reset
The I2C interface built into the ISL6422 is automatically reset at power-on. The I2C interface block will receive a Power OK logic signal from the UVLO circuit. This signal will go HIGH when chip power is OK. As long as this signal is LOW, the interface will not respond to any I2C commands and the system register SR1 and SR2 are initialized to all zeros, thus keeping the power blocks disabled. Once the VCC rises above UVLO, the POWER OK signal given to the I2C interface block will be HIGH, the I2C interface becomes operative and the SRs can be configured by the main microprocessor. About 400mV of hysteresis is provided in the UVLO threshold to avoid false triggering of the power-on reset circuit. (I2C comes up with EN = 0; EN goes HIGH at the same time as (or later than) all other I2C data for that PWM becomes valid).
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ADDR0 and ADDR1 Pins
Connecting either ADDR0 or ADDR1 to GND, the chip I2C interface address is 0001000, but it is possible to choose between four different addresses simply by setting the logic as indicated in Table 19.
TABLE 19. ADDRESS PIN CHARACTERISTICS VADDR VADDR-1 "0001000" VADDR-2 "0001001" VADDR-3 "0001010" VADDR-4 "0001011" ADDR1 0 0 1 1 ADDR0 0 1 0 1
I2C Electrical Characteristics
TABLE 20. I2C SPECIFICATIONS PARAMETER Input Logic High, VIH Input Logic Low, VIL Input Logic Current, IIL Input Hysterisis SCL Clock Frequency TEST CONDITION SDA, SCL SDA, SCL SDA, SCL; 0.4V < VDD < 3.3V SDA, SCL 165mV 0 200mV 100kHz MIN 2.0V 0.8V 10A 235mV 400kHz TYP MAX
I2C Bit Description
TABLE 21. BIT NAME EN1 and EN2 VTOP1 and VTOP2 VBOT1 and VTOP2 ENT1 and ENT2 MSEL1 and MSEL2 TFR1 and TFR2 DCL1 and DCL2 VSPEN1 and VSPEN2 ISEL1H and ISEL2H, ISEL1L and ISEL2L, ISEL1R and ISEL2R OTF CABF1/2 OUVF1/2 OLF1/2 BCF1/2 TTH1/2 ENable Output for channels 1 and 2 Voltage TOP Select (that is, 18V/19V for channels 1 and 2) Voltage BOTtom Select (that is, 13V/14V for channels 1 and 2) ENable Tone for channels 1 and 2 Modulation SELect for channels 1 and 2 Tone Frequency and Rise time select for channels 1 and 2 Dynamic Current Limit select for channels 1 and 2 Voltage Select Pin ENable for channels 1 and 2 Current limit "I" SELect high and low bits for channels 1 and 2 DESCRIPTION
Over Temperature Fault bit CABle Fault or open status bit for channels 1 and 2 Over and Under Voltage Fault status bit for channels 1 and 2 Over Load Fault status bit for channels 1 and 2 Backward Current Fault Bit for channels 1 and 2 Tone THreshold is the OR of the signal pin TXT1 or TXT2
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ISL6422
Package Outline Drawing
L40.6x6
40 LEAD QUAD FLAT NO-LEAD PLASTIC PACKAGE Rev 3, 10/06
4X 4.5 6.00 A B 6 PIN 1 INDEX AREA 31 30 36X 0.50 40 1 6 PIN #1 INDEX AREA
4 . 10 0 . 15 6.00
21 (4X) 0.15 20 TOP VIEW 40X 0 . 4 0 . 1 BOTTOM VIEW 11
10
0.10 M C A B 4 0 . 23 +0 . 07 / -0 . 05
SEE DETAIL "X" 0.10 C BASE PLANE SIDE VIEW ( 36X 0 . 5 ) SEATING PLANE 0.08 C C
0 . 90 0 . 1 ( 5 . 8 TYP ) ( 4 . 10 )
C ( 40X 0 . 23 ) ( 40X 0 . 6 ) TYPICAL RECOMMENDED LAND PATTERN
0 . 2 REF
5
0 . 00 MIN. 0 . 05 MAX. DETAIL "X"
NOTES: 1. Dimensions are in millimeters. Dimensions in ( ) for Reference Only. 2. Dimensioning and tolerancing conform to AMSE Y14.5m-1994. 3. Unless otherwise specified, tolerance : Decimal 0.05 4. Dimension b applies to the metallized terminal and is measured between 0.15mm and 0.30mm from the terminal tip. 5. Tiebar shown (if present) is a non-functional feature. 6. The configuration of the pin #1 identifier is optional, but must be located within the zone indicated. The pin #1 indentifier may be either a mold or mark feature.
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FN9190.1 April 10, 2007
ISL6422 Thin Shrink Small Outline Exposed Pad Plastic Packages (EPTSSOP)
N INDEX AREA E E1 -B1 2 3 TOP VIEW 0.05(0.002) -AD -CSEATING PLANE A 0.25 0.010 L 0.25(0.010) M GAUGE PLANE BM
M38.173B
38 LEAD THIN SHRINK SMALL OUTLINE PLASTIC PACKAGE INCHES SYMBOL A A1 A2 b c D MIN 0.002 0.031 0.0075 0.0035 0.378 0.169 0.246 0.0177 38 0o 8o 0.256 0.126 0o MAX 0.047 0.006 0.051 0.0106 0.0079 0.386 0.177 0.256 0.0295 MILLIMETERS MIN 0.05 0.80 0.17 0.09 9.60 4.30 6.25 0.45 38 8o 6.5 3.2 MAX 1.20 0.15 1.05 0.27 0.20 9.80 4.50 6.50 0.75 NOTES 9 3 4 6 7 11 11 Rev. 0 9/06 NOTES: 1. These package dimensions are within allowable dimensions of JEDEC MO-153-BD-1, Issue F.
A1 0.10(0.004)
A2 c
E1 e E L N
0.0197 BSC
0.500 BSC
e
b 0.10(0.004) M C AM BS
1 2 3
P P1
P1
N P BOTTOM VIEW
2. Dimensioning and tolerancing per ANSI Y14.5M-1982. 3. Dimension "D" does not include mold flash, protrusions or gate burrs. Mold flash, protrusion and gate burrs shall not exceed 0.15mm (0.006 inch) per side. 4. Dimension "E1" does not include interlead flash or protrusions. Interlead flash and protrusions shall not exceed 0.15mm (0.006 inch) per side. 5. The chamfer on the body is optional. If it is not present, a visual index feature must be located within the crosshatched area. 6. "L" is the length of terminal for soldering to a substrate. 7. "N" is the number of terminal positions. 8. Terminal numbers are shown for reference only. 9. Dimension "b" does not include dambar protrusion. Allowable dambar protrusion shall be 0.08mm (0.003 inch) total in excess of "b" dimension at maximum material condition. Minimum space between protrusion and adjacent lead is 0.07mm (0.0027 inch). 10. Controlling dimension: MILLIMETER. Converted inch dimensions are not necessarily exact. (Angles in degrees) 11. Dimensions "P" and "P1" are thermal and/or electrical enhanced variations. Values shown are maximum size of exposed pad within lead count and body size.
All Intersil U.S. products are manufactured, assembled and tested utilizing ISO9000 quality systems. Intersil Corporation's quality certifications can be viewed at www.intersil.com/design/quality
Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.
For information regarding Intersil Corporation and its products, see www.intersil.com 19
FN9190.1 April 10, 2007

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